Back when our new old house was built, it probably had nice solid-wood windows and doors to go with the nice wood flooring. Had it not been located in a neighborhood that had a few down decades, and had it not been a full-time rental for more than thirty years, those features might have survived.
Instead, the original wood interior doors were, at some point, replaced with hollow fiberglass. As anyone who's lived with these knows, they are only a visual barrier; if you actually want sound-deadening, they're useless.
I didn't feel we needed a door for the den, since it wasn't going to be a full-time bedroom. Having a hinged door would mean that to get access to the den closet, the door would have to be closed. That is just plain annoying. Accordingly, we took that door off altogether. There is now a drapery arrangement for the nights when someone is escaping snoring by sleeping on the couch. (Hey: middle-aged people. We snore.)
The bedroom and bathroom got new solid-core doors. Unfortunately, the jamb of the bathroom door was pretty shredded, and that door will need to be taken off again, so that the screw holes can be filled with wood putty, so that the hinges can be screwed back in to something that is more substantial.
Meanwhile, the windows throughout the house - except for the trio of tall windows at the front - had all been replaced, probably in the late 1970s. The windows on the north side of the house are rather flimsy aluminum-framed windows, which are adequate for the climate. They were NOT adequate for securing a heavy window-mounted heater/AC unit - mounting bracket notwithstanding.
Mr. P spent a full day building a new supplemental frame inside the existing window frame so that the window unit could be secured properly. It's not going anywhere now, the unit works great, and the extra carpentry is neat and clean.
I don't know if the shed roof on the front of the house, which was removed to great rejoicing, was original. It was horrible, anyway. The builder would have been much better advised to make a little portico over the front door, with a gable roof matching the main gable. Style, people: it's a thing. A thing which is not that complicated.